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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c68b68df8fe28b874b413def4d0eaf5a482b4f30a403f7343f54c41144d5db' 
  AND token = '+fQSdc5kgzbVycuW7ZX2UkmbOEh1R1uUWrVxHtbVIqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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