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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f620373cebf4d2e57b425b5cf78ceb5e449b64f6bcb2aebc6315356fcff5acf' 
  AND token = 'eQwEtRRc9G4hq/qbqbeYRvDUbmTVYI2jQL/pXXClufA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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