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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418361dce99b845c0bd48f358c5c0a6b6c9ca3ab21b51d80ea68356039e8523d' 
  AND token = '5uoELTjfP1+gFWPiR5MZP4cXSAljRckhIqY0awQF3UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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