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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983cc2034ec7eae7b41635b04b9daec3e92dacac51e6ab4f571ddd3b99f9bdc1' 
  AND token = 'z+xzV4PDfqr3cGCeV/dKB/CJ4OKL5PeN9nGCoX4tRTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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