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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4002716b4b31da18e4ee58bb51a9f35d512481914d1d29c5a6fd21f2a6e24e1f' 
  AND token = 'KyzyYH1JI1BVBWp8tdpIVt6HBc5jr5O1U6x1lEdFhf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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