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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9b8b2c3f77c3dc377c26ec34d4a33380a5000bf38fdb0c24a5aa81ef5dc016' 
  AND token = 'AXuSf7Vpk8MrdTQv6RhZrqcq8eeXgfVFmZhbYnGtrf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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