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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311d4c586c08c64355f58471a8348f18d5f4c82e2c01978463cfc3ca9ad4b6bd' 
  AND token = 'sHuXetDbhS9z01JqkSCOULYhblkUBU3ivAvxDj43CgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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