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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae435c8cb6b56d72545fa4944429c2e5f5ad1274d4271f08f8cfe591c6bb43b3' 
  AND token = 'n0wy64lbsuhUImUFeU0LlQo6Tt48LVpocdlO+d+dLHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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