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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2261dfc040c5693d3b53438d9b5f0f2239777659ea4ed0c5dac0b792ddfda0b' 
  AND token = 'tovx7SlSz8Q47cyuIJvIGdtP199IsgzqwbWkWrku9MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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