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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175364e819de981e5ed886433b707f3f19e92b545911e051264eadcd26104d8e' 
  AND token = 'UIQfH3PzXFABxDdagF3p28Nz0X0mYWYnlYjrBBcSJS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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