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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc906904217d87cf9b9bf2835c9cceda78ddbdf5ed503bddddbbcfa45554ce9' 
  AND token = 'BDjlH8VTjVwTAMxAh4bnweHaj9g/ae+123qBRb6VZus=' 
  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"
    }
  }
}