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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3da0f07194888f62b3347af5d4c60a2d22022d92b97d6a904b120cd4892e2e' 
  AND token = 'fxz6getQMgCUDljyM63dpq+tF1ZzsKmd24TXf+8ON+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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