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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03b14cc2492dbd60dbd6d39089c37abc18c2b78e5bd62146e9e22b3eddc93e7' 
  AND token = 'g0gZrT/WJ48u3vclAST2qn6U8/JJtDNiXIOODvanekk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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