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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b995f6cd898977781ec0320375eb8939aa6c210314057eab5c164ba6d5a2daa' 
  AND token = 'Q2STzrQIo0FNxr8vLTcZmxEFN3zCeJ/CWxarTR5MLW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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