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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27dbb9d6206a30397774d10a1af54b6917dd5b66f5beeb9761b0e657d5c44e96' 
  AND token = '2MnwVx2HR7WTCN6eQZAt7p+JTFt8FrJPDalM6RH3suA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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