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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00509406a11d7ca9d9ad6bdfe105109522abdc0b2a4be7cdaa08cdf3220f4d2' 
  AND token = '8/VUlaoyb3r0dcgo6AYL3GrypfZAaYKho5qsrCHoWkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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