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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac057014c34bc3d4615490ba1ccad7f07b6c7fe1028fc69bf5be05d8704a683b' 
  AND token = 'EMFk+/oiFW6NTA0LUje68tOAL3TNEWFx8SUWyO8T3dY=' 
  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"
    }
  }
}