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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4246b91f881f999f0453df26adda452b2bc0f391b26cd064376d04334891cbae' 
  AND token = 'mSLrw/QXaCttlH3f081Zt+4wK3ABV88exKynwh2Muhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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