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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9d418208256752186d22bad48f115df52b4c84a5bc152c276757f870bb1c9e' 
  AND token = '6akfQUQKbZG49uTlHO8VL24KIf/2CJ6/6wpHCNN15jk=' 
  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"
    }
  }
}