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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0af30c84c40a9779d7cde0c0b69f629aaa64a76cf234f7a7395cddd666d31c' 
  AND token = 'ea/Yt1z3FIsDS8rP0uWiT23bHLcZ17GVYd45ok2/1dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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