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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aac74249be53e0bb795f787669b45a9eeb45fe1d9eca9215e16fd222ac75962' 
  AND token = 'ATIQ1SPGuRKEAuE+1sIcwCn4e9tiqIhJI4t8DVaT/mQ=' 
  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"
    }
  }
}