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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ddfa7a0c34fbf04a7aae92e49b58f27d6c7c7209db8bb111b3810bde14c7ee' 
  AND token = '2MZOmLLJA7Igo97bbqtce3e4Cb3dUjmPQ68T2xRgf+0=' 
  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"
    }
  }
}