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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b317ff77e4c50ee2add1bcee1f641e1e11eff3c05a2173d1ae6e4a5a00a64ff' 
  AND token = 'F9PF+vXWl8y1trbVkNrOBtKu0wwakgltRyaI7kHy92Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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