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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a71d0f4736cfeff53bb195603450f3d1e2ef907046cce80f9744f76e8398233' 
  AND token = '08SBrSpGtWIYiYMwj35uVQpr+ITOSMuE2R61gKera/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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