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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d1d9e6c5cbb06beb04cf2560577b60608bd1ef65c541572d4f32f15e3b0bac' 
  AND token = 'M+xoyceHiybq/Gdp9+4Rkp/yyWOAY89WJ3dIpNtT7UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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