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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c962790a74e9481969fd4f6cc08050bd1abc0c856a0c6437a71b837515a6553' 
  AND token = 'KVPuMuR8+uM0+Xn3UwlTMv+bvgtHGsN8lERhv1nGxUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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