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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a5a795d2879899296f00e3441bc233593868ffc842ce0a69026f8b77197f9d' 
  AND token = 'mOjLAXLVHWH6XeaSioc9z9+fQts9jpthXkv2iLDEEsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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