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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f2a41843a62c27357549ee07babe4d4529c8ca4dd8a9f51fbf03c56e7b6218' 
  AND token = 'zRf2uJ9eTDsP1dCixzEAMZsDk/9JSSMDJ4OsO0bxj38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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