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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b454c0b54ead8eb42ebdeda7ade6d01586d0cbd7e659742205ca2abca6ca15a8' 
  AND token = '/iq5IcaIFXh9UXG1Z7MeHzA+2tNSicNU8+gOGkRd54w=' 
  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"
    }
  }
}