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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510ea01c411cebd654d320ac0a3d6f8e449f1e2dd5f363de030d0a361b09c3ff' 
  AND token = 'mdLiPLS2gYtppBPtn3WYGxYhXwQcxeTEpphySOPW940=' 
  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"
    }
  }
}