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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dbe006feb66908a7290c6fe539b1741b0bc700b4f05ca451b5fc29095d3f64' 
  AND token = '/N+f+g6fXD0iEnTEFvOUcAU/q0TcALFUpsy0zVCpL2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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