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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d160d1f27721d844a7435c5d35e0db2d51c3831068e48e6f2702309a367a6f' 
  AND token = 'q6cnioPZEztlP779UY0mkaBW77gLsVLtTP57joDUwrg=' 
  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"
    }
  }
}