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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fecd9feaf23437be0622cc54e0326c503b4f39b2d8efa58aa45efc52f370046' 
  AND token = 'kc7EEuU2xSuov7PTNIxOlfROJCyqyVE/MQWrBnvqSk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}