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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b86d5c633683a8b5c9ce316a04c30b86ca44b3ee9a0b866c025d9b7d1df02bd' 
  AND token = 'CX0Va/WEgqGHB7+d78gQcxWnO1ZSu/KMC92icxl+vyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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