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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86632eff7c1de14d9640d0208d2dc8cdcf479d3811590b8aeee061f3f031c8f7' 
  AND token = 'pH6Fb2mzeL2CYT40DXvRqCYO1rThVQln6oRP2DsVpQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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