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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3761de499044e148a77f6b6bf3383a86725595999bf2a8f7315b3c45f391d3b2' 
  AND token = 'f9GBilo3G5iTHxUoPWeax/RbmGFwa8sQXLiPaob0BtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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