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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8708ed4445c0769e7359476d1783bf282741104509b77b1de4b1ddc3aca90a22' 
  AND token = 'iJA049FX1+W8Xv0W/Iuo9cGUFCnTvxFYCtPn621NOYE=' 
  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"
    }
  }
}