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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67c480339cbe25c59c17979209f9bd812309e7a1b9b6cac0335bad80701a7d3' 
  AND token = 'naMU8crrrl9qX1cAcVh/3OoNXyLvFOW1LPV/OH+mCyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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