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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f400e05c2c1259920173dfd0bee764e9427b5a9e5490ebabf6ef5aa2c99b94d4' 
  AND token = 'SYJ4j5koA5YiFqma5gC3lJADDl+qujC9omB+e8BzehE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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