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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50c01d18fc4d020d866ab53b38d712fb3e2b0497e0138ee23d556e976c33baf' 
  AND token = 'X/IwQUcLrX90K0Aj49BQedp4GSmSG5n24x46F/mAxiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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