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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8c62539df981b4839ef92a849205cd33ed6ff86b71f94ba11b28377688da3f' 
  AND token = 'JVrjgP4G7jLcnx9I+75SEdA/ACF8wkcnkRjjny4jmqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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