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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bae32a664f6aa199b9e2a2b2eb62e707f15ef8f785463ae1c973f0efa3628e' 
  AND token = '4ZFG2AqZYkNsXu0GGslNevTknOPfaBkm8+fBY6zf4R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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