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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e593b3e485615774c0b63c6d665e27dac8d14b52d5e9d0bab59eb9c7de2763a8' 
  AND token = 'Usdq2EEIQA3fNtCEVBHea5j9SxqGEYwhm7VUVzexOxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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