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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cc01e68dda2b9f77da1c6e296e62327b0ff455a116ef4abd0d79fd1e1808c6' 
  AND token = 'CcQR15r7q6G/Ol0AxefM4M/RcpRYViokX0GeRWce3MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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