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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e721f40d5527d660532522a8933b7e52c2bb53319c8e0d630bcb0d1fa04014a' 
  AND token = 'eBxZdvlZfOHKVOELVzkwwfazkI/L+ryZdTmbkiAgy1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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