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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3d02b5d7b84a1aea1b544b9820f05ab5d6aabccb8f09c4b372abdf0d865a3d' 
  AND token = '/H9WHxiSAAgghGLx12VN1JIbQVV4zS1QAZDuGHiRJDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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