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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44818f14000f22bdb7b7fdd32be8e8a9694207a8cf8f78800fd2f0e695c416da' 
  AND token = 'oBqo0sOuz+D1zuyv647Lh7On+jNMp3L+BC7WE+wa3lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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