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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f01f45251f9b5d0cd11257cb5ab2d2d7d752ff80ddfb589d9d41ce421b8c95' 
  AND token = 'SgzVpECFeTaV2LXu1tOavSGoO1B99ixlV6KzYDrzj6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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