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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149ea27a514f645285f5db08a8ee8ec197ef8307964633148ba7b78ec8dd805c' 
  AND token = 'BxRi+F7K9eObUcY1Q5N5jw2yfT8uPYPWykrKG4L8OV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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