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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2345a0dad2850d49600b155998a4f70987dbf8ec6d83b34d8a029923264cc803' 
  AND token = '8IHtdHsX4WL0fKAykGrZlsV0HpaF5oidBPW3GMi7o+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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