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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fccd32be2094945e6de29112ddfea2b18fac91621f6e8aa5d92e6908d97781f' 
  AND token = 'iADQp80a3TKOxzaP5ltkEVg++eh04dvaKtlV6hpjJ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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