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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929dfdc7d3039c7b2e21c9e474582201b7001e9b0e28ce6736002f7e40ebeb44' 
  AND token = '7jyMONCZvhSpzs2KvtTqFHKR2nF0Pwae4ggTLNSNkeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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