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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccfbf2193369f5994e3f79febece3b3ab5e31eacbdb585b03ef447fd9b542a0f' 
  AND token = '/hk6EognJrloYd1e1TFQYGX0rtma4FHtF6jsXesoj3s=' 
  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"
    }
  }
}