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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787d08f69f38448e0faaf589d41c4cbd3221feae0760eb23dc09dbcd74280c1a' 
  AND token = 'GP8yLjs1l98NExy/0wJRaYYSzBLoL1Ny4rA3iESPH90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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